Cosmetic brush



FIG. 1 is a top, front and right side perspective view of a cosmetic brush showing my new design;

FIG. 2 is a bottom, rear and left side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a perspective view of the cosmetic brush in its holder.

The broken lines in the drawings are for the purpose of illustrating portions of the cosmetic brush that form no part of the claimed design. 

CLAIM The ornamental design for a cosmetic brush, as shown and described. 